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Association Between Implementation of a Universal Face Mask Policy for Healthcare Workers in a Health Care System and
Dee Dee Wang1, William W O'Neill, Marcus J Zervos
1Division of Cardiovascular Disease, Center for Structural Heart (Dr Wang, Dr O'Neill); Infectious Disease (Dr Zervos, Dr McKinnon, Dr Alangaden, Dr Suleyman); Family Medicine (Dr Allard); Public Health Sciences (Dr Schultz, Dr Poisson); Office of Clinical Quality and Safety, Henry Ford Health System (Dr Chu); and Department of Neurosurgery (Dr Kalkanis), Henry Ford Hospital, Detroit, Michigan.
Objective:
Examine the effect of a universal facemask policy for healthcare workers (HCW) and incidence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) positivity.
Methods:
Daily number of symptomatic HCW tested, SARS-CoV-2 positivity rates, and HCW job-descriptions were collected pre and post Universal HCW facemask policy (March 26, 2020). Multiple change point regression was used to model positive-test-rate data. SARS-CoV-2 testing and positivity rates were compared for pre-intervention, transition, post-intervention, and follow-up periods.
Results:
Between March 12 and August 10, 2020, 19.2% of HCW were symptomatic for COVID-19 and underwent SARS-CoV-2 testing. A single change point was identified ∼March 28-30 (95% probability). Before the change point, the odds of a tested HCW having a positive result doubled every 4.5 to 7.5 days. Post-change-point, the odds of a tested HCW having a positive result halved every 10.5 to 13.5 days.
Conclusions:
Universal facemasks were associated with reducing HCW's risk of acquiring COVID-19.
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